CVE-2021-47961: Synology SSL VPN Client

High severity, CVSS 8.1. EPSS: 0.3% chance of exploitation in the next 30 days.

A plaintext storage of a password vulnerability in Synology SSL VPN Client before 1.4.5-0684 allows remote attackers to access or influence the user's PIN code due to insecure storage. This may lead to unauthorized VPN configuration and potential interception of subsequent VPN traffic when combined with user interaction.

Affected products

• Synology SSL VPN Client: before 1.4.5-0684 (fixed in 1.4.5-0684)

Published 2026-04-10. Last modified 2026-06-17.